projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 96518518 PM |
1 | /* |
| 2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | * | |
| 8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/kernel.h> | |
| 12 | #include <linux/init.h> | |
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/netlink.h> | |
| 15 | #include <linux/netfilter.h> | |
| 16 | #include <linux/netfilter/nf_tables.h> | |
| 17 | #include <net/netfilter/nf_tables_core.h> | |
| 18 | #include <net/netfilter/nf_tables.h> | |
| 19 | ||
| 20 | struct nft_immediate_expr { | |
| 21 | struct nft_data data; | |
| 22 | enum nft_registers dreg:8; | |
| 23 | u8 dlen; | |
| 24 | }; | |
| 25 | ||
| 26 | static void nft_immediate_eval(const struct nft_expr *expr, | |
| 27 | struct nft_data data[NFT_REG_MAX + 1], | |
| 28 | const struct nft_pktinfo *pkt) | |
| 29 | { | |
| 30 | const struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
| 31 | ||
| 32 | nft_data_copy(&data[priv->dreg], &priv->data); | |
| 33 | } | |
| 34 | ||
| 35 | static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = { | |
| 36 | [NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 }, | |
| 37 | [NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED }, | |
| 38 | }; | |
| 39 | ||
| 40 | static int nft_immediate_init(const struct nft_ctx *ctx, | |
| 41 | const struct nft_expr *expr, | |
| 42 | const struct nlattr * const tb[]) | |
| 43 | { | |
| 44 | struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
| 45 | struct nft_data_desc desc; | |
| 46 | int err; | |
| 47 | ||
| 48 | if (tb[NFTA_IMMEDIATE_DREG] == NULL || | |
| 49 | tb[NFTA_IMMEDIATE_DATA] == NULL) | |
| 50 | return -EINVAL; | |
| 51 | ||
| 52 | priv->dreg = ntohl(nla_get_be32(tb[NFTA_IMMEDIATE_DREG])); | |
| 53 | err = nft_validate_output_register(priv->dreg); | |
| 54 | if (err < 0) | |
| 55 | return err; | |
| 56 | ||
| 57 | err = nft_data_init(ctx, &priv->data, &desc, tb[NFTA_IMMEDIATE_DATA]); | |
| 58 | if (err < 0) | |
| 59 | return err; | |
| 60 | priv->dlen = desc.len; | |
| 61 | ||
| 62 | err = nft_validate_data_load(ctx, priv->dreg, &priv->data, desc.type); | |
| 63 | if (err < 0) | |
| 64 | goto err1; | |
| 65 | ||
| 66 | return 0; | |
| 67 | ||
| 68 | err1: | |
| 69 | nft_data_uninit(&priv->data, desc.type); | |
| 70 | return err; | |
| 71 | } | |
| 72 | ||
| 73 | static void nft_immediate_destroy(const struct nft_expr *expr) | |
| 74 | { | |
| 75 | const struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
| 76 | return nft_data_uninit(&priv->data, nft_dreg_to_type(priv->dreg)); | |
| 77 | } | |
| 78 | ||
| 79 | static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
| 80 | { | |
| 81 | const struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
| 82 | ||
| 83 | if (nla_put_be32(skb, NFTA_IMMEDIATE_DREG, htonl(priv->dreg))) | |
| 84 | goto nla_put_failure; | |
| 85 | ||
| 86 | return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data, | |
| 87 | nft_dreg_to_type(priv->dreg), priv->dlen); | |
| 88 | ||
| 89 | nla_put_failure: | |
| 90 | return -1; | |
| 91 | } | |
| 92 | ||
| 93 | static struct nft_expr_ops nft_imm_ops __read_mostly = { | |
| 94 | .name = "immediate", | |
| 95 | .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)), | |
| 96 | .owner = THIS_MODULE, | |
| 97 | .eval = nft_immediate_eval, | |
| 98 | .init = nft_immediate_init, | |
| 99 | .destroy = nft_immediate_destroy, | |
| 100 | .dump = nft_immediate_dump, | |
| 101 | .policy = nft_immediate_policy, | |
| 102 | .maxattr = NFTA_IMMEDIATE_MAX, | |
| 103 | }; | |
| 104 | ||
| 105 | int __init nft_immediate_module_init(void) | |
| 106 | { | |
| 107 | return nft_register_expr(&nft_imm_ops); | |
| 108 | } | |
| 109 | ||
| 110 | void nft_immediate_module_exit(void) | |
| 111 | { | |
| 112 | nft_unregister_expr(&nft_imm_ops); | |
| 113 | } |